SP vs DP & performance metrics

Article: Computational Efficiency for CPUs and GPUs in 2012
By: Eric (eric.kjellen.delete@this.gmail.com), July 29, 2012 12:08 pm
Room: Moderated Discussions
aaron spink (aaronspink.delete@this.notearthlink.net) on July 29, 2012 5:39 am wrote:
> Also lets not forget that by the time this
> happens we are likely going to see some form of stacked memory in reasonably
> wide use, which means that the CPUs will likely have 1-4 GB of ultra high
> bandwidth "cache". Which if used right would provide enough bandwidth buffer to
> have the I/Os plus having the option to direct route to/from networkMIC would
> make the 102.4 GB/s CPU memory subsystem reasonable.
>

Would it be possible to have separate memory controllers (presumably there could be several controllers to provide a very wide bus, like on a GPU) for the stacked memory and map parts of the coherent (CPU) memory space to that DRAM? I.e. some range of the memory addresses could refer to those memory controllers and offer extreme bandwidth (but limited capacity) for vector processing. I'm not exactly sure how that would be handled by software and programmers, if the hardware part is viable, but with proper OS support I'm guessing that segments of the virtual memory space could be reserved for the physical memory addresses mapped to the stacked memory. As far as I can figure that solution would be compatible with both integrated LRB cores in the CPU uncore (as has been speculated to appear in Skylake) or with AVX execution units in the core.
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New Article: Compute Efficiency 2012David Kanter2012/07/25 12:37 AM
  New Article: Compute Efficiency 2012SHK2012/07/25 01:31 AM
    New Article: Compute Efficiency 2012David Kanter2012/07/25 01:42 AM
  New Article: Compute Efficiency 2012none2012/07/25 02:18 AM
    New Article: Compute Efficiency 2012David Kanter2012/07/25 10:25 AM
  GCN (NT)EBFE2012/07/25 02:25 AM
    GCN - TFLOP DPjp2012/08/09 12:58 PM
      GCN - TFLOP DPDavid Kanter2012/08/09 02:32 PM
        GCN - TFLOP DPKevin G2012/08/11 04:22 PM
      GCN - TFLOP DPEric2012/08/09 04:12 PM
        GCN - TFLOP DPjp2012/08/10 12:23 AM
          GCN - TFLOP DPEBFE2012/08/12 07:27 PM
            GCN - TFLOP DPjp2012/08/13 01:02 AM
              GCN - TFLOP DPEBFE2012/08/13 06:45 PM
                GCN - TFLOP DPjp2012/08/14 12:21 AM
  New Article: Compute Efficiency 2012Adrian2012/07/25 03:39 AM
    New Article: Compute Efficiency 2012EBFE2012/07/25 08:33 AM
    New Article: Compute Efficiency 2012David Kanter2012/07/25 10:11 AM
  New Article: Compute Efficiency 2012sf2012/07/25 05:46 AM
    New Article: Compute Efficiency 2012aaron spink2012/07/25 08:08 AM
      New Article: Compute Efficiency 2012someone2012/07/25 09:06 AM
    New Article: Compute Efficiency 2012David Kanter2012/07/25 10:14 AM
      New Article: Compute Efficiency 2012EBFE2012/07/26 01:27 AM
        BG/QDavid Kanter2012/07/26 08:31 AM
          VR-ZONE KNC B0 leak, poor number?EBFE2012/08/03 12:57 AM
            VR-ZONE KNC B0 leak, poor number?Eric2012/08/03 06:59 AM
              VR-ZONE KNC B0 leak, poor number?EBFE2012/08/04 05:37 AM
                VR-ZONE KNC B0 leak, poor number?aaron spink2012/08/04 05:51 PM
                Leaks != productsDavid Kanter2012/08/05 02:19 AM
                  Leaks != productsEBFE2012/08/06 01:49 AM
                VR-ZONE KNC B0 leak, poor number?Eric2012/08/05 09:37 AM
                  VR-ZONE KNC B0 leak, poor number?EBFE2012/08/06 02:09 AM
                    VR-ZONE KNC B0 leak, poor number?aaron spink2012/08/06 03:33 AM
                      VR-ZONE KNC B0 leak, poor number?jp2012/08/07 02:08 AM
                        VR-ZONE KNC B0 leak, poor number?Eric2012/08/07 03:58 AM
                          VR-ZONE KNC B0 leak, poor number?jp2012/08/07 04:17 AM
                            VR-ZONE KNC B0 leak, poor number?Eric2012/08/07 04:22 AM
                              VR-ZONE KNC B0 leak, poor number?anonymou52012/08/07 08:43 AM
                            VR-ZONE KNC B0 leak, poor number?jp2012/08/07 04:23 AM
                              VR-ZONE KNC B0 leak, poor number?aaron spink2012/08/07 06:24 AM
                        VR-ZONE KNC B0 leak, poor number?aaron spink2012/08/07 06:20 AM
                          VR-ZONE KNC B0 leak, poor number?jp2012/08/07 10:22 AM
                            VR-ZONE KNC B0 leak, poor number?EduardoS2012/08/07 02:15 PM
                        KNC has FMADavid Kanter2012/08/07 08:17 AM
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      New Article: Compute Efficiency 2012hobold2012/07/27 10:53 AM
        New Article: Compute Efficiency 2012Eric2012/07/27 11:51 AM
          New Article: Compute Efficiency 2012hobold2012/07/27 01:48 PM
            New Article: Compute Efficiency 2012Eric2012/07/27 02:29 PM
        New Article: Compute Efficiency 2012anon2012/07/29 01:25 AM
          New Article: Compute Efficiency 2012hobold2012/07/29 10:53 AM
  Efficiency? No, lack of highly useful featuressomeone2012/07/25 08:58 AM
    Best case for GPUsDavid Kanter2012/07/25 10:28 AM
      Best case for GPUsfranzliszt2012/07/25 12:39 PM
      Best case for GPUsChuck2012/07/25 07:13 PM
        Best case for GPUsDavid Kanter2012/07/25 08:45 PM
        Best case for GPUsEric2012/07/27 04:51 AM
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  New Article: Compute Efficiency 2012Unununium2012/07/25 04:55 PM
    New Article: Compute Efficiency 2012EduardoS2012/07/25 07:12 PM
      Ops... I'm wrong...EduardoS2012/07/25 07:14 PM
  New Article: Compute Efficiency 2012TacoBell2012/07/25 07:36 PM
    New Article: Compute Efficiency 2012David Kanter2012/07/25 08:49 PM
    New Article: Compute Efficiency 2012Michael S2012/07/26 01:33 AM
  Line and factorMoritz2012/07/26 12:34 AM
    Line and factorPeter Boyle2012/07/27 06:57 AM
      not entirelyMoritz2012/07/27 11:22 AM
      Line and factorEduardoS2012/07/27 04:24 PM
        Line and factorMoritz2012/07/28 11:52 AM
  tables Michael S2012/07/26 01:39 AM
  Interlagos L2+L3Rana2012/07/26 02:13 AM
    Interlagos L2+L3Rana2012/07/26 02:13 AM
    Interlagos L2+L3David Kanter2012/07/26 08:21 AM
      SP vs DP & performance metricsjp2012/07/27 06:08 AM
        SP vs DP & performance metricsEric2012/07/27 06:57 AM
          SP vs DP & performance metricsjp2012/07/27 08:18 AM
            SP vs DP & performance metricsaaron spink2012/07/27 08:36 AM
              SP vs DP & performance metricsjp2012/07/27 08:47 AM
                "Global" --> systemPaul A. Clayton2012/07/27 09:31 AM
                  "Global" --> systemjp2012/07/27 02:55 PM
                    "Global" --> systemaaron spink2012/07/27 06:33 PM
                      "Global" --> systemjp2012/07/28 01:00 AM
                        "Global" --> systemaaron spink2012/07/28 05:54 AM
                          "Global" --> systemjp2012/07/29 01:12 AM
                            "Global" --> systemaaron spink2012/07/29 04:03 AM
                              "Global" --> systemnone2012/07/29 08:05 AM
                                "Global" --> systemEduardoS2012/07/29 09:26 AM
                                "Global" --> systemjp2012/07/30 01:24 AM
                                  "Global" --> systemaaron spink2012/07/30 02:05 AM
                                "Global" --> systemaaron spink2012/07/30 02:03 AM
                                  daxpy is STREAM TRIADPaul A. Clayton2012/07/30 05:10 AM
                SP vs DP & performance metricsaaron spink2012/07/27 06:25 PM
                  SP vs DP & performance metricsEmil Briggs2012/07/28 05:40 AM
                    SP vs DP & performance metricsaaron spink2012/07/28 06:05 AM
                      SP vs DP & performance metricsjp2012/07/28 10:04 AM
                        SP vs DP & performance metricsBrett2012/07/28 02:32 PM
                      SP vs DP & performance metricsEmil Briggs2012/07/28 05:11 PM
                        SP vs DP & performance metricsanon2012/07/29 01:53 AM
                        SP vs DP & performance metricsaaron spink2012/07/29 04:39 AM
                          Coherency for discretesRohit2012/07/29 08:24 AM
                          SP vs DP & performance metricsanon2012/07/29 10:09 AM
                          SP vs DP & performance metricsEric2012/07/29 12:08 PM
        SP vs DP & performance metricsaaron spink2012/07/27 08:25 AM
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      New Article: Compute Efficiency 2012Ingeneer2012/07/30 07:04 PM
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            Memory power and bandwidth?David Kanter2012/08/04 10:22 AM
              Memory power and bandwidth?Michael S2012/08/04 01:36 PM
              Memory power and bandwidth?Iain McClatchie2012/08/06 01:09 PM
              Memory power and bandwidth?Eric2012/08/07 05:28 PM
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                  WorkloadsEric2012/08/09 04:21 PM
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                  Latency and bandwidth bottlenecks Eric2012/08/09 04:32 PM
                    Latency and bandwidth bottlenecks none2012/08/10 05:06 AM
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            Memory power and bandwidth?Ingeneer2012/08/06 10:26 AM
  NV aims for 1.8+ TFLOPS DP ?jp2012/08/11 12:21 PM
    NV aims for 1.8+ TFLOPS DP ?David Kanter2012/08/11 08:25 PM
      NV aims for 1.8+ TFLOPS DP ?jp2012/08/12 01:45 AM
      NV aims for 1.8+ TFLOPS DP ?EBFE2012/08/12 09:02 PM
        NV aims for 1.8+ TFLOPS DP ?jp2012/08/13 12:54 AM
          NV aims for 1.8+ TFLOPS DP ?Gabriele Svelto2012/08/13 08:16 AM
            NV aims for 1.8+ TFLOPS DP ?Vincent Diepeveen2012/08/14 02:04 AM
          NV aims for 1.8+ TFLOPS DP ?David Kanter2012/08/13 08:50 AM
            NV aims for 1.8+ TFLOPS DP ?jp2012/08/13 10:17 AM
        NV aims for 1.8+ TFLOPS DP ?EduardoS2012/08/13 05:45 AM
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